Plain-net loom



E. CAVlGELLl.

PLAIN NET LOOM. APPLICATION mso MAR. 25. 1921.

1,428,756.. Patented Sept. 12,1922.-

Patented Sept. 12, 1922.

1 units t. ice 1 F? fir li EMANUEL CAVIGELLI, OF ST. MARGARE'THE'DI.NEAR. MUNCH'WILEN, SYVITZERLANI), ASSIGNOB TO THE FIBLVI' SGI-IWEIZGESELLSCHAFT FT 'R TULLINDUSTBIE A.-G., OF

MUNCHWILEN, SVTITZERLAND.

PLAIN-NET LOOIVI.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. I4.1313.)

and I do hereby declare the following tobe a clear, full, and exactdescription of the invention, such as will enable others skilled intheart to which it appertains to make and use the same, reference beinghad to the accompanying drawings, and to letters or figures of referencemarked which form a part of this specification.

This invention relates to improvements in plainnet looms andparticularly to an automatic fabric winding device for tulle looms.Automatic fabric winding devices are known which produce a gradualincrease of the warp tension by an increase in the speed of-rotation ofthe card beam and on whichrests the cloth beam, frictionally driventhereby. This increase of warp tension is effected by a gradual anduniform increase in the feed movement of the card beam, which isobtained by a movement or shifting of the point of engagement of adriving rod operating the feed lever. In

known devices of this kind, the feed move-.

ment of the card beam is produced by means of a feed lever which isoperated by a vertically reciprocating driving rod. The movement of thepoint of engagement of vthe driving rod operating the feed lever, re-

quired for shifting it, is derived from the rotary motion of the cardbeam through known gears. In the device according to the invention, themovement required for moving the point of engagement of the feed lever,is derived from the up and down movement of the driving rod, and istherefore independent of the rotation of the card beam.

To that end, a couplingrod connected to the driving rod, is providedwith a stop thereon,-

which during the upward movement acts on a vertical rod connected to alever, and the said rod in co-operation with lever, pawl and ratchetwheel and a worm wheel gear, produces the movement or shifting of thepoint of engagement of the feed lever. In plain net looms besides thevertical warp threads and horizontal weft threads, there are usedthreads that in the finished fabric are inclined 30 upward and threadsthat are'inclined 30 downward. The inclined threads with the warp andweft form a hexagonal ground figure when the tension is on the threads.

The inclined threads are provided from a spool system, and the greaterthe number of threads being supplied from a single spool the smallermust be the diameter of the spool; consequently the greater is the pullrequired to turn the spool. The tension of the weft threads thereforebecomes greater as the process proceeds, and this will produce adistortion of the ground figure if care is not taken to simultaneouslyincrease the tension on the warp. This I do by increasing the draft onthe warp by increasing the speed'of the rough-surfaced card beam, by amechanism I shall now describe in detail.

A construction according to the inven tion is illustrated by way ofexample in the accompanying drawings, in which Figure 1 shows a frontelevation,

Figure 2 a side elevation and- Figure 3 a plan, partly in section on theline II of Figure 1, and

Figure 4 a general arrangement of the plain net loom provided with thedevice according to the invention.

The working of the construction according to the invention will beexplained simultaneously with the description of its single parts.

The finished fabric is wound by a card beainl, the feed movement ofwhich is for instance derived from a cam disc 42 mounted on the drivingshaft 43 by the interposition of a swinging lever 44 or it may bederived from any oscillating driving part of the loom and transmitted toa vertically reciprocating driving rod 2. The driving rod 2 is connectedby a pin 3 to'alever t which swings about a pin 6 of the machine frame.The oscillation of the lever 4 is transmitted through a pin 8, couplingrod 7 and a pin 9 'to' a link lever 10 rigidly connected to a ratchetgear casing 11 rotatably mounted on a spindle 12. In the casing 11 areprovided thirty one pawls 13 which are mounted in a loosely rotatablemanner on pins 14 and pressed by suitably arranged springs against aratchet wheel 15 provided with thirty two teeth. The 'pawls are soarranged relatively to the teethv that only one pawl is always incomplete engagement with a tooth interval of the wheel 15. An advance ofthe wheel 15 accordingly takes place when the lever 10 is oscillated tothe extentof 1/31 of the pitch. For preventing the wheel from turningback relatively to the casing, in the casing part 16 are also providedthirty one spring controlled pawls loosely rotatable on pins 17. Thecasing 16 is secured by means of screws 19 to a stand 20 secured to themachine frame 5. The movement is transmitted to the card beam by theratchet wheel 15 which is keyed to the spindle 12, which carries a worm21 engaging'with a worm wheel 22 keyed to a spindle 23 which carries thecard beam 1.

On the coupling rod 7 is provided a stop 24 which can be secured indifferent vertical positions on the coupling rod 7 and which during theupward movement, presses upwards a rod 25. vThis movement is transmittedby a bolt 26 to a lever 27, the loose centre of rotation of which issituated on a spindle 28, and by a. pawl 29 to a ratchet wheel 30 whichis turned to the extent of at least one tooth division. The rotation ofthe ratchet wheel 30 is transmitted by a worm 31 also firmly secured tothe spindle 28, and by a worm wheel 32 meshing with it, to a spindle 33mounted in a stand 20. On the screw threaded spindle 33, the movement ofthe ratchet wheel 30 moves towards the machine a double L-shaped guide34 secured to the nuttravelling on the spindle. In the guide 34 travelsup and down a slide block 35 connected to the coupling rod 7, inaccordance with the up and down movements of the coupling rod7. Duringthe inward movement of the guide 34 caused by the ratchet wheel 30, thepin 9 moves in the link lever 10 towards the machine, and in that waythe feed movement of the wheel 15 is increased. To the gradual movementor shifting of the coupling rod 7 towards the machine corresponds, withthe invariable stroke of the driving rod 2, a gradually and uniformlyincreased speed of rotation of the card beam.

A scale 36 is arranged on the stand20 above the spindle 33, on whichscale is set the guide 34 at the beginning of the working period. Thisis done by disengaging the pawl 29 from the ratchet wheel 30and agreedpoint of the by turning a crank 37 in the direction opposite to the feedor advance, until an index' 38 provided on the guide 34, reaches anscale. With the assistance of the scale 36, the attendant can seewhether the device according to the invention is working correctly.

The scale 39 provided on the lever 4, makes it possible to read theextent of movement of the centre of rotation 8 by means of the spindle40 and hand wheel 41. of finer qualities of plain net fabrics, thegradual increase in the advance movement of the card beam mustbeo-fcourse smaller than in the case of coarser fabrics, sothat in thecase of finer fabrics, the pin 8 is set towards the beginning of thescale-39, and

In the case in the case of coarser fabrics,ltowards the end of the same.

By moving the stop 24 along the'coupling rod 7, the movement of thepoint of engagement 9 on the feed lever 10 can bein fluenced to thewidest possible extent.

With this device tulle may be manufactured with diflerent Widths of meshon'one and the same machine, without changing the stroke of the drivingrod 2.

I claim:

1. In an automatic fabric winding device for plain net looms, thecombination of means comprising a feed .lever operatively connected tothe card beam, and adapted to effect a feed motion of the latter, anoscillat ing member engaging with said feed lever effect a feed motionof the latter, an oscillating member engaging with said feed, lever thepoint of engagement being displaoeably arranged along said feedlever, aguide provided for said point of engagement, a lever adapted to effect adisplacement of said guide towardsthe fulcrum'of said feed-lever by theinterposition of a gearga stop provided on said oscillating memberlandhoacting with said lever, and'means interposed between saidoscillating-member andadriving part of the "100111 to impart theoscillating movement tothe former.

3. In an automatic fabric windin device for plain net looms, the'combina ion of means comprising a feed lever operatively connected tothe card'beam and adapted to I effect a feed motion of the latter,an'oscil lating member engaging with its upper end with said feed lever,the point of engagement being held in a guide, a lever adapted to effecta displacement of said guide to wards the fulcrum of said feed lever forgradually increasing the feed motion by the interposition of a pawl, aratchet wheel, worm wheel gear and screw threaded spindle, a stopprovided on said oscillating member and coacting with said lever, aswingably mounted lever to which the lower end ofsaid oscillating memberis pivoted, and a driving rod interposed between a driving part of the100111 and said swingably mounted lever for imparting an oscillatingmovement to the latter and thus to the oscillating member.

l. In an automatic fabric winding device for plain net looms, thecombination of means comprising a feed lever operatively connected tothe card beam and adapted to eiiect a feed motion of the latter, anoscillating member engaging with its upper end with said feed lever, thepoint of engagement being held in a guide, a lever adapted to effect adisplacement of said guide towards the fulcrum of said teed lever forgradually increasing the -teed motion through the intermediary of agear, a stop provided on said oscillating member and coacting with saidlever, a swingably mounted lever to which the lower end of saidoscillating member is pivoted, means to displace said pivot along ascale provided on said swingably mounted lever for altering the feedmotion to correspond to a desired alteration of mesh of the tullefabric, and a driving rod interposed between a driving part of the loomand said swingably mounted lever for imparting an oscillating movementto the latter and thus to the oscillating memher.

5. In an automatic fabric winding device for plain net looms, thecombination of means comprising a feed lever operatively connected tothe card beam and adapted to effect a feed motion of the latter, anoscillating member engaging with its upper end with said teed lever, thepoint of engagement being held in a guide, a lever adapted to effect adisplacement of said guide towards the fulcrum of said feed lever forgradually increasing the feed motion through the intermediary of a gear,a stop provided on said oscillating member and coacting with said leverand adapted to be adjusted along said oscillating member for alteringthe feed motion, a swingably mounted lever to which the lower end ofsaid oscillating member is pivoted, means to displace said pivot along ascale provided on said swingably mounted lever for altering the feedmotion to correspond to a desired alteration oi the mesh of the tullefabric, and a driving rod interposed between a driving part of the loomand said swingably mounted lever for imparting an oscillating movementto the latter and thus to the oscillating member.

6. In an automatic fabric winding device for plain net looms, a fabricbeam, a ratchet wheel secured thereto, a large number of pawls actingthereon only one of which is in full engagement with the said wheel atany one time, a pawl carrier surrounding said wheel, a lever connectedto the carrier, a reciprocable rod having sliding connection with thelever, a lever pivoted at one end to a fixed part and adjustablyconnected with the end of said rod, mechanism to progressively shortenthe effective length of the first lever and an adjustable stop on saidrod to actuate said mechanism.

In testimony that I claim the foregoing as my invention, I have signedmy name.

EMANUEL GAVIGELLI.

